NEC PD75P402 Instrukcja Użytkownika Pobierz pdf (Strona 170)

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CHAPTER 9. INSTRUCTION SET

9.4 INSTRUCTION FUNCTIONS AND APPLICATION

9.4.1 Move Instructions

MOV A, #n4

Function: A ← n4; n4 = I3 to I0 : 0 to FH

Moves 4-bit immediate data n4 to the A register (4-bit accumulator).

This instruction has a stacking effect (group A). When placed after a MOV A, #n4 or MOV XA, #n8 instruction,

stack instructions following the executed instruction are processed as NOP.

Application examples:

➀ Set 0BH into accumulator.

MOV A, #0BH

➁ Select the data to be output at Port 3 from 0 to 2.

A0: MOV A, #0

A1: MOV A, #1

A2: MOV A, #2

OUT PORT 3, A

MOV rp, #n8

Function: rp ← n8; n8 = I7 to I0 : 00H to FFH

Moves 8-bit immediate data n8 to register pair rp (XA, HL).

This instruction has a stacking effect. There are two stacking effects: Group A (MOV A, #n4 instruction and

MOV XA, #n8 instruction), and group B (MOV HL, #n8 instruction). When instructions of the same group are

placed consecutively, the stack instructions after the executed instruction are processed as NOP.

Application example: Set 5FH into register pair HL.

MOV HL, #5FH

MOV A, @HL

Function: A ← (HL)

Moves the data memory contents addressed by the contents of register pair HL to the A register.

Application example: Move the data of address 3EH to the A register.

MOV HL, #3EH

MOV A, @HL

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NEC PD75P402 Instrukcja Użytkownika Strona 170